<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 默认头像区域 -->
      <div class="avatar-box">
        <img src="../assets/logo.png" alt />
      </div>
      <!-- 表单区域 -->
      <el-form
        label-width="0"
        class="formLogin"
        :model="loginForm"
        :rules="loginFormRules"
        ref="loginFormRef"
      >
        <el-form-item prop="username">
          <el-input prefix-icon="el-icon-user-solid" v-model="loginForm.username"></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" type="password" prefix-icon="el-icon-lock"></el-input>
        </el-form-item>
        <el-form-item class="btns">
          <el-button type="primary" @click="login('loginFormRef')">提交</el-button>
          <el-button type="info" @click="resetForm('loginFormRef')">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      loginForm: {
        username: 'admin',
        password: '123456',
      },
      // form验证规则
      loginFormRules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '用户名长度为3-10位', trigger: 'blur' },
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 10, message: '密码长度为3-10位', trigger: 'blur' },
        ],
      },
    }
  },
  methods: {
    // 重置表单
    resetForm(formName) {
      this.$refs[formName].resetFields()
    },
    //登录
    login(formName) {
      //获取在登录之前的预验证,使用了async和await来简化返回的promise对象，
      //再利用解构赋值将返回值中的data赋给res
      this.$refs[formName].validate(async (valid) => {
        console.log(valid)
        if (!valid) return
        const { data: res } = await this.$http.post('/login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登陆失败')
        this.$message.success('登陆成功')
        //1.登陆成功后，取出返回的token存入sessionStorage
        // 1.1 项目中除了登录之外的接口，均需要在登陆之后才能访问
        // 1.2 token存在sessionStorage中只在当前网站打开时生效
        console.log(res)
        window.sessionStorage.setItem('token', res.data.token)
        //2.通过编程式导航跳转到后台主页，路由地址：/home
        this.$router.push('/home')
      })
    },
  },
}
</script>

<style lang='less' scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
  position: relative;
}

.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.avatar-box {
  height: 130px;
  width: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  box-shadow: 0 0 10px #ddd;
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #fff;

  img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
  }
}
.btns {
  display: flex;
  justify-content: flex-end;
}
.formLogin {
  width: 100%;
  padding: 0 20px;
  position: absolute;
  bottom: 0;
  box-sizing: border-box;
}
</style>
